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Preparation method for multi-level structured molybdenum disulfide microsphere negative electrode material of lithium battery

A technology of molybdenum disulfide and negative electrode materials, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of uneven distribution, poor cycle performance and rate performance, cumbersome preparation process, etc., and achieve excellent electrochemical performance , excellent electrochemical performance, and the effect of shortening the transmission path

Inactive Publication Date: 2016-05-25
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing the negative electrode material of molybdenum disulfide microsphere lithium ion battery with multilevel structure, which is a method for preparing multilevel structure molybdenum disulfide microsphere lithium ion battery by one-step hydrothermal method The method of the negative electrode material overcomes the shortcomings of the large size and uneven distribution of the multi-stage molybdenum disulfide prepared in the prior art, and it is difficult to control the microscopic morphology of the molybdenum disulfide, and the lithium ion battery negative electrode material prepared by it Defects of lithium deintercalation performance, poor cycle performance and rate performance, cumbersome preparation process and high production cost

Method used

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  • Preparation method for multi-level structured molybdenum disulfide microsphere negative electrode material of lithium battery
  • Preparation method for multi-level structured molybdenum disulfide microsphere negative electrode material of lithium battery
  • Preparation method for multi-level structured molybdenum disulfide microsphere negative electrode material of lithium battery

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Embodiment 1

[0032] Weigh the required amount of sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O) and urea (H 2 NCSNH 2 ) and dissolved in deionized water to prepare a mixed solution of sodium molybdate and urea, so that sodium ammonium molybdate (Na 2 MoO 4 ) and urea (H 2 NCSNH 2 ) was controlled at a mol ratio of 1:1, using a magnetic stirrer to stir the mixed solution for 15min at a speed of 150r / min to obtain a clear mixed solution that was evenly mixed. The pH of the solution was 1, and then the mixed solution was transferred to a reaction kettle with polytetrafluoroethylene as the substrate, the reaction kettle was placed in an oven, and kept at 150°C for 4 hours, and then the reaction kettle was naturally cooled to At room temperature, take out the mixed solution after the reaction, centrifuge the reaction solution at a speed of 3000r / min and wash the centrifuged reactant with deionized water, then centrifuge the washed reactant at a speed of 3000r / min, and centrifuge the prec...

Embodiment 2

[0041] Weigh the required amount of sodium molybdate dihydrate (Na2MoO 4 2H 2 O) and urea (H 2 NCSNH 2 ) and dissolved in deionized water to prepare a mixed solution of sodium molybdate and urea, so that sodium ammonium molybdate (Na 2 MoO 4 ) and urea (H 2 NCSNH 2 ) was controlled at a mol ratio of 1:5, using a magnetic stirrer to stir the mixed solution for 20min at a speed of 150r / min to obtain a clear mixed solution that was evenly mixed. The pH of the solution is 1, and then the mixed solution is transferred to a reaction kettle with polytetrafluoroethylene as the substrate, the reaction kettle is placed in an oven, and kept at 200 ° C for 5 hours, and then the reaction kettle is naturally cooled to At room temperature, take out the mixed solution after the reaction, centrifuge the reaction solution at a speed of 5000r / min and wash the centrifuged reactant with deionized water, then centrifuge the washed reactant at a speed of 5000r / min, and centrifuge the precipita...

Embodiment 3

[0045] Weigh the required amount of sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O) and urea (H 2 NCSNH 2 ) and dissolved in deionized water to prepare a mixed solution of sodium molybdate and urea, so that sodium ammonium molybdate (Na 2 MoO 4 ) and urea (H 2 NCSNH 2) in a mol ratio of 1:10, using a magnetic stirrer to stir the mixed solution for 15 min with a rotating speed of 150r / min, to obtain a clear mixed solution that was evenly mixed, at this time dropwise dripping a mass fraction of 37% hydrochloric acid solution to make the mixed solution The pH of the solution was 0.7, and then the mixed solution was transferred to a reaction kettle with polytetrafluoroethylene as the substrate, the reaction kettle was placed in an oven, and kept at 250°C for 6 hours, and then the reaction kettle was naturally cooled to At room temperature, take out the mixed solution after the reaction, centrifuge the reaction solution at a speed of 6000r / min and wash the centrifuged reactan...

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Abstract

The invention relates to a preparation method for a multi-level structured molybdenum disulfide microsphere negative electrode material of a lithium battery. The method comprises the following steps of firstly, dissolving sodium molybdate dehydrate and urea in deionized water, and stirring the mixed solution for 15-60 minutes; secondly, dropwise adding hydrochloric acid to adjust a pH value to be 0-1, transferring the mixed solution in a reaction kettle taking polytetrafluoroethene as a substrate, preserving the mixed solution at 150-250 DEG C for 1 to 40 hours, naturally cooling the mixed solution to a room temperature, taking out the mixed solution after reaction, washing sediments after centrifugal separation, placing the mixed solution in an electrothermal blowing dry box for drying, taking out the mixed solution and placing the mixed solution in a mortar to grind into fine powder; and finally preparing the multi-level structured molybdenum disulfide microsphere negative electrode material of the lithium battery. With the adoption of a simple test method and process steps, the multi-level structured molybdenum disulfide microspheres with relatively small grain sizes (200-250 nanometers) and which are uniformly distributed are prepared, and the negative electrode material has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery and a preparation method thereof, in particular to a preparation method of a negative electrode material of a multilevel structure molybdenum disulfide microsphere lithium ion battery. Background technique [0002] As a novel, high-energy, non-polluting chemical power source, lithium-ion batteries have been widely used in energy storage fields such as portable electronic devices, electric vehicles and hybrid electric vehicles. However, with the emergence of problems such as excessive consumption of earth resources and environmental pollution, higher requirements are put forward for the capacity, energy density and cycle performance of lithium-ion batteries. The anode material of lithium ion battery is one of the keys to determine its electrochemical performance. At present, the theoretical capacity of widely used commercial carbon anode materials is only 372 mAh / g, making ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397H01M10/0525
CPCH01M4/1397H01M4/5815H01M10/0525Y02E60/10
Inventor 张永光殷福星王新谭台哲
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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